6: The most used hex-wrench sizes are... A 4 and 5mmB 6 and 7mmC 8 and 10mmD 3 and 4mm

7: Your perfectly adjusted rear derailleur suddenly seems tweaked, as your chain now skips around between shifts. The first thing you should do is... A Tighten the limit screws a half turnB Turn the derailleur’s barrel adjuster a half turn counterclockwiseC Check thatyour wheel is positioned correctly in the dropoutD Clean your drivetrain

8: If your rear disc brake howls when you stop... A True the rotorB Clean the rotorC Brake less oftenD Check your pads for wear

9: To straighten your handlebar, loosen...

Photo: Charlie Layton

10: To get a tubeless tire to seat, help it along... A With a tire leverB By removing the valve-stem core before reinflatingC Adding more ­sealantD Hitting it with a hammer